EP0649997B1 - Filtre de séparation gaz-liquide et pompe à vide utilisant un tel filtre - Google Patents

Filtre de séparation gaz-liquide et pompe à vide utilisant un tel filtre Download PDF

Info

Publication number
EP0649997B1
EP0649997B1 EP94307173A EP94307173A EP0649997B1 EP 0649997 B1 EP0649997 B1 EP 0649997B1 EP 94307173 A EP94307173 A EP 94307173A EP 94307173 A EP94307173 A EP 94307173A EP 0649997 B1 EP0649997 B1 EP 0649997B1
Authority
EP
European Patent Office
Prior art keywords
vacuum pump
filter
filter element
gas
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94307173A
Other languages
German (de)
English (en)
Other versions
EP0649997A1 (fr
Inventor
John Cambridge Smith
Alex George Hunter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOC Group Ltd
PSI Global Ltd
Original Assignee
BOC Group Ltd
PSI Global Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BOC Group Ltd, PSI Global Ltd filed Critical BOC Group Ltd
Publication of EP0649997A1 publication Critical patent/EP0649997A1/fr
Application granted granted Critical
Publication of EP0649997B1 publication Critical patent/EP0649997B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H57/00—General details of gearing
    • F16H57/04—Features relating to lubrication or cooling or heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B01D45/14—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by rotating vanes, discs, drums or brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
    • B01D46/003—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions including coalescing means for the separation of liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0052—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with filtering elements moving during filtering operation
    • B01D46/0056—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with filtering elements moving during filtering operation with rotational movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/26—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies rotatable
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/023—Lubricant distribution through a hollow driving shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/02—Lubrication; Lubricant separation
    • F04C29/026—Lubricant separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M13/00—Crankcase ventilating or breathing
    • F01M13/04—Crankcase ventilating or breathing having means for purifying air before leaving crankcase, e.g. removing oil
    • F01M2013/0422—Separating oil and gas with a centrifuge device

Definitions

  • This invention relates to methods and apparatus for the separation of contaminant materials from gas-liquid and/or gas solid aerosols or other gas-liquid mixtures and their application to certain types of machinery.
  • gas-liquid-solid mixtures e.g. including solids which are wear products of rotating machinery
  • gas/vapour mixtures e.g. mixtures of air and a hydrocarbon vapour.
  • Such mixtures which can include liquid and solid particles and possibly vapour, are generically referred to as "polydispersed aerosols".
  • coalescing filters are known which can bring about such a separation.
  • coalescing filters are known in which a gas containing small suspended droplets of liquid such as oil or the like - commonly referred to as a "mist" is separated and the liquid is retained in the filter.
  • Coalescing filters can be made from a variety of materials including glass microfibres, especially borosilicate glass microfibres. It has recently been proposed to surface treat the microfibres with a fluorochemical or other material that imparts oleophobic and/or hydrophobic properties, and such treated coalescing filters may also be usable for present purposes.
  • Coalescing filters are generally of annular or tubular shape and may be formed by moulding or pleating sheets of microfibres.
  • Coalescing filter elements are generally formed with a mechanical support structure, for example, a layer of expanded metal, in contact with one or both of the surfaces of the coalescing filter element, and having sufficient open area as not to interfere with the filter operation.
  • DE-C-37 37 221 discloses an oil-air separator with a fixed housing and having a rotor and an inwoard-flow tubular filter and an array of blocks which are spaced over the circumference of the rotor and which act to throw oil particles outwards on to the housing wall.
  • This invention is based on the discovery that the use of rotary coalescing filters in vacuum pumps in particular can improve the separation of a gas-liquid mixture (including a polydispersed aerosol) with relatively low pressure drop across the filter, approximating to dry filter performance when the filter is rotated at a range of speeds.
  • Such operating conditions may include cyclical duty in which rpm is varied and at the higher speed of the duty range liquid is centrifuged from the filter.
  • the invention is useful especially in the case where a gas-liquid stream to be separated is urged through the filter from a predetermined direction.
  • a vacuum pump having at least one pumping chamber and a gear drive mechanism physically isolated from the pumping chamber, the vacuum pump having a gearbox having an internal space in which there is a rotatable shaft operated by the gear drive mechanism, a coalescing filter carried by and rotatable with the shaft and means for establishing flow of liquid-contaminated gas from the internal space through the filter such that non-contaminated gas passes into a hollow interior of the shaft, characterised in that the coalescing filter presenting a generally cylindrical exterior surface to the interior space for gas inflow into the filter from a generally radial direction and for generally radial ejection of coalesced liquid.
  • the invention also provides means for removing one component, normally the gaseous component, from the chamber and preferably to recycle at least a part of said gaseous component into the chamber.
  • the filter is of annular or tubular shape and is attached to the shaft in concentric fashion.
  • the gas outlet side of the filter should communicate with the substantially axially oriented bore by means of one or more substantially radially oriented bores in the shaft, the latter generally being in position within the filter.
  • the invention is suitable for use in vacuum pumps which incorporates a gear drive mechanism.
  • the pumps tend to produce in use in the area of the gear box a gas-liquid mixture in which the gas component is air or, possibly a purged gas such as nitrogen or mixtures of air and nitrogen, and the liquid component is in the form of small droplets of lubricant or the like which are dispersed in or suspended by the gas component.
  • the gears themselves will generally be engaging a shaft and the gear box will represent a substantially closed chamber containing a gear drive mechanism with a shaft or shafts passing through the walls thereof.
  • a drive motor itself may be within or without the chamber.
  • the gear drive mechanism prefferably be contained in a chamber the interior of which can be physically isolated from the pumping chambers thereof.
  • "dry" vacuum pumps which are used extensively in applications, for example semiconductor manufacture, where it is essential for the pump lubricants not to contaminate the pumping chambers so as to obviate the danger of lubricant contamination of the semiconductor or the like equipment being subjected to vacuum condition.
  • Such "dry” vacuum pumps commonly posses two shafts each one carrying a set of rotors and being positioned in the pump body such that corresponding rotor pairs (one from each shaft) inter-engage to effect the pumping action within their own pumping chamber.
  • the ends of the shafts remote from the pumping chambers generally possess inter-meshing gears and one of the shafts is rotated by means of a motor to effect rotation via the gears of both shafts in opposite direction thereby effecting the pumping action by the rotor pairs.
  • the gear drive mechanism, the ends of the shafts and preferably the motor itself are all contained in a separate chamber sealed from the pumping chamber by shaft seals and other seals.
  • the lubricants and cooling fluids associated with the gear drive mechanism are therefore also contained within their separate chamber.
  • the methods of the invention are particularly suitable for such vacuum pumps.
  • the droplets of liquid lubricant caused by the rotating gears in particular form a liquid air mixture within the chamber containing the gears which can be separated in accordance with the invention.
  • the filter is, in accordance with preferred embodiments of the invention, annular in shape and is mounted concentrically about one of the shafts, normally the non-driven shaft, and an internal bore passageway linking the gas outlet from the filter to a point outside that chamber is provided.
  • Means must be provided to urge the gas liquid mixture through the filter. This may be provided by a positive pressure at the exterior surface of the filter or by a negative pressure to the interior of the filter.
  • Such means can be, for example, the introduction of a flow of air or preferably an inert gas such as nitrogen, into the chamber to cause a circulation of air or inert gas into the chamber through the filter and through the shaft bore or passageway and thereby to the outside of the chamber.
  • the air or inert gas is then caused to recirculate back into the chamber on a continuous flow basis, with the whole of the gas flow, or a part of the gas flow being recirculated.
  • Such recirculation may conveniently be provided by incorporating means into the pump to return air or gas passing through the shaft back into the chamber, for example by means of a screw thread on the rotating shaft at a point where the shaft is in close proximity to a pump body portion so that the air/gas is fed down the outside of the shaft and back into the chamber.
  • a small air pump could be employed. In such ways there is a continuous feed of air/gas through the filter.
  • the filter rotates with the shaft and the liquid component will generally be retained therein. Once retained, droplets coalesce to form sufficiently large drops of liquid, said drops are ejected from the filter by centrifugal force, and, for example, allowed to fall under gravity into the pump oil sump or will exit radially with sufficient velocity to impact on the nearest available surface.
  • the coalescing filter itself may be any type of filter falling within this general classification and may have a coalescing layer alone or a coalescing layer and an external drainage layer, and may be any of the types referred to in the introduction to this specification.
  • a coalescing filter having a flow path as aforesaid has been found in principle to be suitable for shafts having rotational speeds up to about 13,000 rpm typically 500-10,000 rpm, e.g. 2000-6000 rpm.
  • Embodiments of the coalescing filter can exhibit high filtration efficiency, and pressure drop of about 4-5 cm of water at running speeds of e.g. 2,500-5,000 rpm.
  • the coalescing filter may be of any of the general types described above. There may be an additional requirement to remove contaminant vapour, e.g. a hydrocarbon vapour which may be present together with oil mist in a gearbox especially if the operating temperature is elevated. Such hydrocarbon vapours may be removed by an adsorbent material such as activated carbon which may be provided in a layer located downstream of the coalescing element with reference to the intended direction of gas flow.
  • adsorbent material such as activated carbon
  • UK Patent Specification No. 1508212 (Rolls Royce) shows a centrifugal separator for separating a suspension of a liquid in a gas which comprises a rotatable chamber, an inlet to the chamber for admitting the suspension and an outlet for the chamber in a radially outer part of the chamber, said outlet being separated from the inlet.
  • An outlet for gas is provided in a part of the chamber disposed radially inwardly of the liquid outlet.
  • a packing is provided within the chamber which comprises a relatively rigid matrix which is a metallic mesh formed by plating the metal onto a semi-synthetic open celled foam structure and subsequently removing the synthetic material.
  • the gas flow path into the packing is axial rather than radial, and the packing material used is significantly coarser than the microfibrous materials contemplated by this invention.
  • FIG. 1 of the accompanying drawings shows part of a vacuum pump comprising a shaft (1) positioned within a pump body (2) which includes, as shown, three body portions (3,4,5) all of which are sealingly fixed together.
  • the shaft (1) is mounted for rotation in the body (2) by means of bearings (6) in the body portion (5) and bearings (7) in the body portion (3).
  • the vacuum pump is of the type having a second shaft (not shown) whose axis is parallel to the shaft (1).
  • the shafts have respective gears (8, 9) which engage each other.
  • Means (not shown) are provided to rotate the second shaft about its longitudinal axis with the inter-engaging gears (8, 9) causing the shaft (1) to rotate also.
  • the gears and the drive motor (not shown) generally require lubrication, and it is the oil employed for this purpose that contaminates an internal chamber (11) within which the shaft (1) rotates with a mist of oil suspended in the air or gas present in the chamber.
  • oil is not limited to hydrocarbon oil or mineral oil but is defined to include any lubricating liquid.
  • the shaft (1) is sealed within the body portion (3) by means of shaft seals in the form of a series of piston rings (12) contained in a piston ring carrier (10) secured to and rotatable with the shaft (1). This ensures that the chamber (11) in which the lower parts (as viewed in Figure 1) of the two shaft are contained is sealed from the pumping chambers of the vacuum pump which are positioned above the body portion (3) as viewed in Figure 1.
  • One of the piston rings (12) is positioned between passageways (13,14) in the body portion (3) so that a flow of gas, for example nitrogen, from a common source (A) can be passed to either side of the ring (12) so as to equalise pressure across it, thereby assisting sealing, and causing a generally upward flow of gas (as viewed in Figure 1) across the piston rings above the passageway (13) and hence into the pump outlet.
  • a flow of gas for example nitrogen
  • the shaft (1) is adapted to carry an annular filter (15) in concentric fashion for rotation therewith.
  • the filter comprises an annular coalescing filter element (16) supported at either end by annular end caps (17,18) of U-shaped cross section as shown and which are themselves sealingly fixed to the shaft (1) by means of O-rings (19,20).
  • the end caps (17) have cylindrical annular surfaces of sufficient axial extent to fit tightly onto O-rings (19) with clearances either side.
  • the filter element (16) is further supported and constrained on its outer and inner surfaces by two annular expanded metal components conforming in shape to and in contact with the inner and outer surfaces of the filter element.
  • the piston ring carrier (10) has on the lowermost part of its outer curved surface a two start screw or scroll (24) whose turns afford communication between the bores (23) and the chamber (11).
  • the method of the invention allows air or gas present within the chamber (1) to be urged continuously towards the filter element (16) which it enters in a generally radial direction as shown by the heavier arrows in Figure 1, and thence to circulate through the filter element (16) into the bores (21) and then (22) and finally via the bores (23) where it is returned via the screw (24) back into the chamber (11).
  • the rotation of the screw or scroll (24) itself provides the driving force for recirculation of air or gas in the manner illustrated.
  • oil droplets suspended in the air or gas which are drawn into the filter element (16) are retained therein by virtue of the physical properties of the coalescing filter.
  • Air or gas which has been cleaned of its oil content passes through the filter and is recirculated as described above.
  • Retained oil droplets tend to merge with other droplets retained by the filter to form droplets of increased size and, as they become more massive, the droplets are periodically ejected or flung from the filter in a generally radially outward direction as shown by the smaller arrows.
  • There is a possibility for interaction between the inwardly directed oil-containing air/gas stream and the outwardly directed coalesced oil drops which is believed to enhance filtration efficiency.
  • the filter (15) should normally operate with a low pressure drop across it.
  • the scroll (24) creates an elevated pressure in space (11) which causes the flow of contaminated air through the filter.
  • An excessive pressure drop causes a resistance to this flow, reducing the rate of filtration and permitting oil mist to build up in the space (11).
  • the filter element (15) is shown in greater detail in Figure 2.
  • the annular oil coalescing filter (16) may be fabricated or moulded from a fibrous organic or inorganic material and preferably from a fibrous inorganic material such as glass microfibres. It should have a structure and pore size such that it will retain particles and droplets having a size from about 0.01 to about 10 microns and, in particular particles of size less than about 1.5 microns which form a major component of oil suspended in air in a vacuum pump of the present kind. Suitable media commonly have an efficiency of between 99.97 and 99.9999% when subjected to a dioctyl phthalate test to ASTM D 1986-1971 (Military Standard 282).
  • the coalescing filter may be formed from layers of sheet wrapped one around the other, formed from pleated sheet or, as is preferred in the present case, it is made by moulding or vacuum forming. It will during manufacture normally be impregnated with a resin binder which imparts a degree of mechanical strength and is compatible with the coalescing action. Suitable media for the coalescing element are disclosed in patent specification numbers GB-A-1014882 (Domnick Hunter) and GB-A-1544822 and GB-A-1603519 (Process Scientific Innovations). In particular, it is preferred that the filter element (16) should be moulded from borosilicate glass microfibres according to the process described in GB-A-1603519.
  • the filter (15) which is typically of outside diameter 6cm and length 3cm is formed as a single component for convenience in fitting to or removal from the shaft (1).
  • the inner and outer expanded metal supports (27,28) are offered to the outer and inner surfaces of the element (16), after which the annular end caps (17,18) are adhered thereto.
  • the expanded metal supports (27,28) are conveniently of expanded stainless steel mesh of thickness about 0.5 mm and open area 60%.
  • the element (16) may be of borosilicate glass microfibre impregnated with an epoxy resin, the end caps (17,18) may be machined from aluminium alloy, and they may be adhered to the filter element (16) and inner and outer supports (27,28) by means of an epoxy adhesive, grades of which exhibit good resistance to chemical attack and have service temperatures of, for example, about 130°C.
  • an epoxy adhesive grades of which exhibit good resistance to chemical attack and have service temperatures of, for example, about 130°C.
  • polyurethane or phenolic adhesive can be used, the chemical resistance of phenolic adhesives being especially good.
  • the end cap (17,18) may be made from a rigid plastics material, e.g. a 30% glass-filled polybutylene terephthalate and, on the outer face of the outer expanded metal support (27) there may be provided a drainage layer of large pore size organic woven, non-woven or foam material, e.g. of polyester needle felt, which drainage layer is treated with a fluorocarbon to reduce oil retention.
  • a rigid plastics material e.g. a 30% glass-filled polybutylene terephthalate
  • a drainage layer of large pore size organic woven, non-woven or foam material e.g. of polyester needle felt
  • FIG. 4 shows a further variant in which the coalescing filter has only a single expanded metal support member (27) on the outer surface and is sandwiched between end caps (31,32) which have axial extensions (33) in which are formed retaining grooves (34) for O-ring seals.
  • the filter can be filled onto a plain shaft, and can be supplied complete with a fresh pair of O-ring seals which are held captive within the element and are replaced each time that the element is exchanged.
  • a splash guard fits over the outer cylindrical surface of the filter (15) covering a lower part of the outer surface for most of the axial extend of the exposed part.
  • the splash guard (35) is an annulus of liquid-impermeable material formed with outwardly projecting louvres (37) which are formed with ports (39) at their trailing ends with reference to the direction of rotation as indicated by the arrow. It may conveniently be formed integrally with the lower end cap (35) as shown and be moulded from a suitable plastics material, e.g. glass-filled polybutylene terephatlate.
  • the filter element (15) is likely to be splashed with oil which at these low rotational speeds is retained by the coalescing element (16) and contributes to pressure drop.
  • the splash guard (35) reduces the likelihood of the coalescing element becoming directly splashed with oil and hence enables the filter to operate with a lower pressure drop during starting or at low running speeds, but it does not significantly impede ingress of contaminated air or ejection of coalesced oil droplets.
  • FIG 7 there is shown a further variant of the filter in which the end faces of end caps (17,35), the lower end cap (35) incorporating an integral splash guard as aforesaid, are provided with axially extending seals (40,41).
  • the filter fits in a recess between radially enlarged portions (42,43) of the rotating shaft, one of which is removable to permit the filter to be fitted and replaced.
  • the use of axially extending face seals instead of the shaft seals in the previous embodiments permits a wider range of manufacturing tolerance for the axial spacing between end caps (17 and 35) of the filter.
  • the seals (40,41) are glued in place on the end caps (17,35).
  • the end caps (17,35) could be formed on their end surfaces with an axial extension having a moulded in O-ring receiving groove similar to the groove in Figure 4.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • General Details Of Gearings (AREA)
  • Degasification And Air Bubble Elimination (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)

Claims (16)

  1. Pompe à vide ayant au moins une chambre de pompage et un mécanisme de transmission par engrenages physiquement isolé de la chambre de pompage, la pompe à vide ayant une boíte d'engrenages (3, 4, 5) ayant un espace interne (11) dans lequel se trouvent un arbre rotatif (1) commandé par le mécanisme de transmission par engrenages, un filtre coalescent (15) porté par l'arbre (1) et rotatif avec lui, et des moyens (24) pour créer un flux de gaz contaminé par un liquide, depuis l'espace interne (11) à travers le filtre (15), de telle façon que le gaz non contaminé passe dans un creux intérieur (21, 22) de l'arbre (1), caractérisée en ce que le filtre coalescent (15) présente une surface extérieure de forme générale cylindrique vers l'espace intérieur (11) pour une entrée du gaz dans le filtre (15) d'une direction globalement radiale et pour une éjection globalement radiale du liquide réuni.
  2. Pompe à vide selon la Revendication 1, dans laquelle les moyens (24) entraínent le passage d'au moins une partie du flux de gaz non contaminé de l'intérieur creux (21, 22) en retour dans la boíte d'engrenages (3, 4, 5).
  3. Pompe à vide selon la Revendication 1 ou la Revendication 2, dans laquelle le filtre coalescent (15) comprend un élément de filtre microporeux.
  4. Pompe à vide selon la Revendication 3, dans laquelle l'élément de filtre microporeux est un élément de filtre microfibreux moulé.
  5. Pompe à vide selon la Revendication 3, dans laquelle l'élément de filtre est un élément de filtre microfibreux plissé.
  6. Pompe à vide selon la Revendication 3, dans laquelle l'élément de filtre est formé de feuilles de microfibres sous gaine.
  7. Pompe à vide selon les Revendications 2 à 6, dans laquelle l'élément de filtre comprend des microfibres de verre maintenues ensemble au moyen d'une résine de liaison.
  8. Pompe à vide selon l'une quelconque des Revendications précédentes, dans laquelle le filtre coalescent comprend un élément de filtre microporeux (16) et un élément de support foramineux rigide (27) en contact avec la surface extérieure de l'élément de filtre microporeux.
  9. Pompe à vide selon l'une quelconque des Revendications 3 à 7, dans laquelle le filtre coalescent (15) comprend un élément de filtre microporeux (16) et des éléments de support foramineux rigides (27, 28), en contact respectivement avec les surfaces extérieure et intérieure de l'élément de filtre microporeux (16).
  10. Pompe à vide selon l'une quelconque des Revendications 3 à 7, dans laquelle des bouchons (17, 18) d'extrémité sont fixés de manière adhésive sur des extrémités opposées de l'élément de filtre microporeux (16).
  11. Pompe à vide selon la Revendication 10, dans laquelle l'arbre porte un premier et un second joints étanches (19, 20) espacés axialement qui forment des joints étanches aux gaz avec les bouchons (17, 18) d'extrémité.
  12. Pompe à vide selon la Revendication 10, dans laquelle les bouchons (31, 32) d'extrémité portent des éléments d'étanchéité respectifs qui forment un joint étanche aux gaz avec la surface extérieure de l'arbre (1).
  13. Pompe à vide selon l'une quelconque des Revendications précédentes, dans laquelle est présente au moins une paire d'engrenages (8, 9) en prise grâce auxquels l'arbre (1) est entraíné.
  14. Filtre coalescent tubulaire adapté pour une utilisation dans une pompe à vide telle que définie dans l'une quelconque des Revendications 1 à 13, le filtre coalescent comprenant un élément de filtre microporeux tubulaire et des bouchons d'extrémité collés sur des extrémités opposées de l'élément de filtre, lesdits bouchons d'extrémité ayant une conformation adaptée pour former un joint étanche aux gaz avec un arbre de boíte d'engrenages sur lequel l'élément de filtre est destiné à être installé.
  15. Elément de filtre selon la Revendication 14, dans lequel les bouchons (17, 18) d'extrémité sont conformés avec des surfaces intérieures cylindriques simples adaptées pour former un joint étanche aux gaz avec des anneaux d'étanchéité (19, 20) portés par l'arbre (1) sur lequel l'élément est destiné à être installé.
  16. Elément de filtre selon la Revendication 14, dans lequel les bouchons (17, 18) d'extrémité portent des joints toriques (19) qui, à l'utilisation, forment un joint étanche aux gaz avec la surface cylindrique extérieure de l'arbre (1) sur lequel le filtre coalescent est destiné à être installé.
EP94307173A 1993-10-01 1994-09-30 Filtre de séparation gaz-liquide et pompe à vide utilisant un tel filtre Expired - Lifetime EP0649997B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9320231 1993-10-01
GB939320231A GB9320231D0 (en) 1993-10-01 1993-10-01 Gas-liquid separation methods and apparatus

Publications (2)

Publication Number Publication Date
EP0649997A1 EP0649997A1 (fr) 1995-04-26
EP0649997B1 true EP0649997B1 (fr) 2000-03-22

Family

ID=10742811

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94307173A Expired - Lifetime EP0649997B1 (fr) 1993-10-01 1994-09-30 Filtre de séparation gaz-liquide et pompe à vide utilisant un tel filtre

Country Status (5)

Country Link
US (1) US5863317A (fr)
EP (1) EP0649997B1 (fr)
JP (1) JP3625500B2 (fr)
DE (1) DE69423564T2 (fr)
GB (1) GB9320231D0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007057194A1 (de) * 2007-11-28 2009-06-10 Daimler Ag Getriebehauptwelle oder Getriebevorlegewelle

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1010851A3 (nl) * 1997-01-15 1999-02-02 Atlas Copco Airpower Nv Vloeistofgeinjecteerde compressor met minstens twee samenwerkende compressorelementen.
GB9708397D0 (en) * 1997-04-25 1997-06-18 Boc Group Plc Improvements in vacuum pumps
GB2327460B (en) * 1997-07-23 2000-10-25 Pall Corp Engine fuel systems
DE19824041A1 (de) * 1998-05-29 1999-12-02 Stihl Maschf Andreas Verbrennungsmotor
ITMI981622A1 (it) 1998-07-14 2000-01-14 Losma S R L Aspiratore per nebbie oleose particolarmente per macchine utensili e simili
US6139595A (en) * 1998-09-18 2000-10-31 Fleetguard, Inc. Air/oil coalescer with centrifugally assisted drainage
US6290738B1 (en) * 1999-07-16 2001-09-18 Nelson Industries, Inc. Inertial gas-liquid separator having an inertial collector spaced from a nozzle structure
DE10102809A1 (de) * 2001-01-23 2002-08-14 Senertec Gmbh Ölabscheider
US6640792B2 (en) 2001-08-16 2003-11-04 Commins Engine Company, Inc. Air/oil coalescer with an improved centrifugally assisted drainage
DE10306547B4 (de) * 2003-02-17 2005-08-04 Aerzener Maschinenfabrik Gmbh Drehkolbenmaschine
DE602004006751T2 (de) * 2003-06-25 2007-12-27 Wabco Gmbh Lufttrocknerpatrone
GB0326613D0 (en) * 2003-11-14 2003-12-17 Boc Group Plc Vacuum pump
US7063734B2 (en) * 2004-03-23 2006-06-20 Pratt & Whitney Canada Corp. Air/oil separation system and method
KR100580705B1 (ko) * 2004-07-05 2006-05-15 현대자동차주식회사 오일펌프 일체형 원심분리식 보조 오일필터
US7686859B2 (en) * 2005-08-04 2010-03-30 Johnson Controls Technology Company Coalescing filter element with drainage mechanism
US7786209B2 (en) * 2006-10-27 2010-08-31 Xerox Corporation Nanostructured particles, phase change inks including same and methods for making same
NO330124B1 (no) * 2009-06-11 2011-02-21 Ntnu Tech Transfer As En separator for en gass/væske strøm
BR112014009743A2 (pt) 2011-11-04 2017-05-02 Cummins Filtration Ip Inc separador giratório para separar líquido de mistura fluida
CN102537295B (zh) * 2011-12-23 2014-11-26 中联重科股份有限公司 工程机械及其气液分离减压装置和变速箱装置
US8529668B2 (en) 2012-01-13 2013-09-10 Hamilton Sundstrand Corporation Deaerator outlet diffuser
US8500869B1 (en) 2012-06-21 2013-08-06 Hamilton Sundstrand Corporation Anti-rotation deaerator outlet diffuser
EP3053653B1 (fr) 2015-02-06 2017-11-22 Alfa Laval Corporate AB Séparateur centrifuge d'empilement de disques
CN107405556B (zh) 2015-03-30 2020-11-06 康明斯过滤Ip公司 多级旋转聚结器装置
DE112016001921T5 (de) 2015-06-09 2018-01-11 Cummins Filtration Ip, Inc. System und Verfahren zur Verwendung einer reibungsarmen Kontaktdichtung für einen rotierenden Tropfenabscheider
WO2016200928A1 (fr) 2015-06-09 2016-12-15 Cummins Filtration Ip, Inc. Systèmes et procédés de coalesceurs rotatifs maintenant une recirculation positive par le biais d'un joint dynamique
CN107847839B (zh) 2015-08-21 2020-05-29 康明斯过滤Ip公司 高速旋转曲轴箱通风过滤介质和介质包
US10682601B2 (en) 2015-08-28 2020-06-16 Cummins Filtration Ip, Inc. Rotating coalescing element with directed liquid drainage and gas outlet
CN109072741B (zh) 2016-04-28 2021-01-22 康明斯滤清系统知识产权公司 使气体通过空心轴排出的由内向外旋转聚结器
CN109312647B (zh) * 2016-06-01 2021-07-09 沃尔沃卡车集团 用于内燃发动机的曲轴箱通风系统
CN107975475B (zh) * 2017-11-30 2024-04-16 珠海格力节能环保制冷技术研究中心有限公司 流体机械及具有其的换热设备
CN111168959B (zh) * 2019-12-31 2021-11-30 广东拓斯达科技股份有限公司 气液分离结构与流体进出口连接装置
CN112392563B (zh) * 2020-11-16 2022-11-29 四川航天中天动力装备有限责任公司 一种涡轮发动机用高转速油气分离器

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1580380A (en) * 1924-09-13 1926-04-13 Macdonald Rob Roy Compressed-air clarifier
US2596384A (en) * 1947-07-16 1952-05-13 Dunmire Russell Paul Filter
US3378104A (en) * 1966-03-08 1968-04-16 Gen Electric Air-oil separators for use in gas turbine engines
US3708957A (en) * 1971-02-19 1973-01-09 Farr Co Exhaust filter unit and method of filtering exhaust
GB1508212A (en) * 1975-02-10 1978-04-19 Rolls Royce Apparatus for separating suspension of liquids in gas
GB1544822A (en) * 1976-03-26 1979-04-25 Process Scient Innovations Filter elements for gas or liquid and methods of making such elements
US4217120A (en) * 1977-10-20 1980-08-12 Sundstrand Corporation Air-oil separator for aircraft gearbox
US4415342A (en) * 1980-09-24 1983-11-15 Minnesota Mining And Manufacturing Company Air pollution control process
DE3267325D1 (en) * 1981-12-18 1985-12-12 Ici Plc Separation process
DE8402912U1 (de) * 1984-02-02 1985-07-11 Barmag Barmer Maschinenfabrik Ag, 5630 Remscheid Flügelzellen-Vakuumpumpe
GB8508690D0 (en) * 1985-04-03 1985-05-09 Ici Plc Deaerating water
DE3737221C1 (de) * 1987-11-03 1989-04-27 Mtu Muenchen Gmbh OEl-Luftabscheider
US5415676A (en) * 1993-08-16 1995-05-16 Donaldson Company, Inc. Mist collector cartridge

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007057194A1 (de) * 2007-11-28 2009-06-10 Daimler Ag Getriebehauptwelle oder Getriebevorlegewelle

Also Published As

Publication number Publication date
US5863317A (en) 1999-01-26
JPH07204405A (ja) 1995-08-08
JP3625500B2 (ja) 2005-03-02
GB9320231D0 (en) 1993-11-17
DE69423564D1 (de) 2000-04-27
DE69423564T2 (de) 2000-09-21
EP0649997A1 (fr) 1995-04-26

Similar Documents

Publication Publication Date Title
EP0649997B1 (fr) Filtre de séparation gaz-liquide et pompe à vide utilisant un tel filtre
US4049401A (en) Apparatus for separating suspensions of liquids in gas
CA2506544C (fr) Cuve de filtration et procede permettant d'obtenir un systeme de compresseur a gaz rotatif
US10537842B2 (en) Systems and methods for utilizing a low-friction rotating coalescer contact seal
US20240173661A1 (en) Systems and methods for rotating coalescers maintaining positive recirculation through a dynamic seal
US4400167A (en) Centrifugal separator
US11964224B2 (en) Rotating coalescing element with directed liquid drainage and gas outlet
CA2425999C (fr) Separateur air/huile ameliore
US7022163B2 (en) Method of treating air on board on a vehicle, and a device for use when performing the method
US6152120A (en) Diesel engine system with oil-air separator and method of operation
US4288030A (en) Centrifugal separator
EP1273335A2 (fr) Procédé d'épuration des gaz du carter de vilebrenquin
JPH0450845B2 (fr)
WO1998014257A1 (fr) Element coalescent
KR20130006467A (ko) 피보호 베어링을 갖춘 원심 분리기
KR20180063309A (ko) 가스 정화를 위한 분리기 장치
GB2071510A (en) Centrifugal separator
US4253953A (en) Centrifugal oil filter
GB2049494A (en) Centrifugal separator
JPH0252013A (ja) 液体中の固体および気体異物の一体型分離除去装置
JPH04300610A (ja) ミスト捕集装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): CH DE FR GB IT LI NL

17P Request for examination filed

Effective date: 19951025

17Q First examination report despatched

Effective date: 19960902

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

RIC1 Information provided on ipc code assigned before grant

Free format text: 6B 01D 45/14 A, 6F 04C 29/02 B

RTI1 Title (correction)

Free format text: GAS-LIQUID SEPARATION FILTER AND VACUUM PUMP THEREWITH

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: PSI GLOBAL LTD

Owner name: THE BOC GROUP PLC

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

ITF It: translation for a ep patent filed

Owner name: BARZANO' E ZANARDO MILANO S.P.A.

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE FR GB IT LI NL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20000322

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 69423564

Country of ref document: DE

Date of ref document: 20000427

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: RIEDERER HASLER & PARTNER PATENTANWAELTE AG

ET Fr: translation filed
NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

REG Reference to a national code

Ref country code: GB

Ref legal event code: 732E

REG Reference to a national code

Ref country code: CH

Ref legal event code: PUEA

Owner name: PSI GLOBAL LTD

Free format text: THE BOC GROUP PLC#CHERTSEY ROAD#WINDLESHAM SURREY GU20 6HJ (GB) $ PSI GLOBAL LTD#INDUSTRIAL ESTATE#BOWBURN DURHAM, DH6 5AD (GB) -TRANSFER TO- PSI GLOBAL LTD#INDUSTRIAL ESTATE#BOWBURN DURHAM, DH6 5AD (GB) $ EDWARDS LIMITED#MANOR ROYAL#CRAWLEY, WEST SUSSEX RH10 9LW (GB)

REG Reference to a national code

Ref country code: FR

Ref legal event code: TQ

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20130927

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20130927

Year of fee payment: 20

Ref country code: FR

Payment date: 20130919

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20130924

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20130927

Year of fee payment: 20

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69423564

Country of ref document: DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R071

Ref document number: 69423564

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20140929

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20140929